crda

send to the kernel a wireless regulatory domain for a given ISO / IEC 3166 alpha2

Synopsis

crda

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environment variable

Set the COUNTRY environment variable with a specific ISO / IEC 3166 alpha2 country code and then run crda without arguments. This will send a regulatory domain for that alpha2 to the kernel.

rsa digital signature

If built with openssl or gcrypt support crda will have embedded into it an RSA digital signature which will prevent it from reading corrupted or non-authored regulatory.bin files. Authorship is respected by the RSA public key packed into crda. This specific crda package has been built with an RSA public key from John Linville (the Linux wireless kernel maintainer) and as such will only read regulatory.bin files signed by him. For further information see the regulatory.bin man page.

udev rule

A udev regulatory rule must be put in place in order to receive and parse udev events from the kernel in order to get udev to call crda with the passed ISO / IEC 3166 alpha2 country code. An example udev rule which can be used (usually in /lib/udev/rules.d/85-regulatory.rules ):

KERNEL=="regulatory*", ACTION=="change", SUBSYSTEM=="platform", RUN+="/sbin/crda"

see also

iw regulatory.bin

http://wireless.kernel.org/en/developers/Regulatory/